Which of the following sets of drugs represent inotropic drugs?
  1. Digoxin, dopamine, milrinone
  2. Verapamil, digitoxin, isosorbide dinitrate
  3. Diltiazem, metoprolol, amrinone
  4. Nicorandil, dobutamine, carvedilol
Explanation
Answer: A - The classes of agents included in the ionotropic group of drugs include cardiac glycosides such as digitalis, digitoxin, and digoxin; phosphodiesterase inhibitors such as amrinone and milrinone; and sympathomimetics such as dopamine, dobutamine, isoproterenol, metaraminol, epinephrine and norepinephrine.
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